2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/225089We calculate the 1-loop effective potential of an Abelian Higgs model within the R_{ξ/σ} class of non-linear gauges that preserves the Higgs-boson low-energy theorem. The R_{ξ/σ} gauge involves two gauge-fixing parameters ξand σ, and is a renormalizable extension of the Feynman--'t Hooft R_ξset of gauges beyond the 1-loop level. By taking consistently into account Goldstone--gauge-boson mixing effects, we show how the 1-loop effective potential evaluated at its extrema is independent of both ξand σ, in agreement with the Nielsen identity. The 1-loop constant and wavefunction renormalizations are presented within this non-linear R_{ξ/σ} class of gauges.15 pages, LaTeX, 1 figure, references addedHigh Energy Physics - Phenomenologytext